diff --git a/plotjuggler_app/plot_docker.cpp b/plotjuggler_app/plot_docker.cpp
index f4fdf4b82..ac77fed24 100644
--- a/plotjuggler_app/plot_docker.cpp
+++ b/plotjuggler_app/plot_docker.cpp
@@ -323,6 +323,10 @@ DockWidget::DockWidget(PlotDataMapRef& datamap, QWidget* parent)
 
 DockWidget::~DockWidget()
 {
+  if (_plot_widget) {
+    delete _plot_widget;
+    _plot_widget = nullptr;
+  }
 }
 
 DockWidget* DockWidget::splitHorizontal()